<?php

class bmp {

    var $mpdf = null;

    function bmp(&$mpdf) {
        $this->mpdf = $mpdf;
    }

    function _getBMPimage($data, $file) {
        $info = array();
        // Adapted from script by Valentin Schmidt
        // http://staff.dasdeck.de/valentin/fpdf/fpdf_bmp/
        $bfOffBits = $this->_fourbytes2int_le(substr($data, 10, 4));
        $width = $this->_fourbytes2int_le(substr($data, 18, 4));
        $height = $this->_fourbytes2int_le(substr($data, 22, 4));
        $flip = ($height < 0);
        if ($flip)
            $height = -$height;
        $biBitCount = $this->_twobytes2int_le(substr($data, 28, 2));
        $biCompression = $this->_fourbytes2int_le(substr($data, 30, 4));
        $info = array('w' => $width, 'h' => $height);
        if ($biBitCount < 16) {
            $info['cs'] = 'Indexed';
            $info['bpc'] = $biBitCount;
            $palStr = substr($data, 54, ($bfOffBits - 54));
            $pal = '';
            $cnt = strlen($palStr) / 4;
            for ($i = 0; $i < $cnt; $i++) {
                $n = 4 * $i;
                $pal .= $palStr[$n + 2] . $palStr[$n + 1] . $palStr[$n];
            }
            $info['pal'] = $pal;
        } else {
            $info['cs'] = 'DeviceRGB';
            $info['bpc'] = 8;
        }

        if ($this->mpdf->restrictColorSpace == 1 || $this->mpdf->PDFX || $this->mpdf->restrictColorSpace == 3) {
            if (($this->mpdf->PDFA && !$this->mpdf->PDFAauto) || ($this->mpdf->PDFX && !$this->mpdf->PDFXauto)) {
                $this->mpdf->PDFAXwarnings[] = "Image cannot be converted to suitable colour space for PDFA or PDFX file - " . $file . " - (Image replaced by 'no-image'.)";
            }
            return array('error' => "BMP Image cannot be converted to suitable colour space - " . $file . " - (Image replaced by 'no-image'.)");
        }

        $biXPelsPerMeter = $this->_fourbytes2int_le(substr($data, 38, 4)); // horizontal pixels per meter, usually set to zero
        //$biYPelsPerMeter=$this->_fourbytes2int_le(substr($data,42,4));	// vertical pixels per meter, usually set to zero
        $biXPelsPerMeter = round($biXPelsPerMeter / 1000 * 25.4);
        //$biYPelsPerMeter=round($biYPelsPerMeter/1000 *25.4);
        $info['set-dpi'] = $biXPelsPerMeter;

        switch ($biCompression) {
            case 0:
                $str = substr($data, $bfOffBits);
                break;
            case 1: # BI_RLE8
                $str = $this->rle8_decode(substr($data, $bfOffBits), $width);
                break;
            case 2: # BI_RLE4
                $str = $this->rle4_decode(substr($data, $bfOffBits), $width);
                break;
        }
        $bmpdata = '';
        $padCnt = (4 - ceil(($width / (8 / $biBitCount))) % 4) % 4;
        switch ($biBitCount) {
            case 1:
            case 4:
            case 8:
                $w = floor($width / (8 / $biBitCount)) + ($width % (8 / $biBitCount) ? 1 : 0);
                $w_row = $w + $padCnt;
                if ($flip) {
                    for ($y = 0; $y < $height; $y++) {
                        $y0 = $y * $w_row;
                        for ($x = 0; $x < $w; $x++)
                            $bmpdata .= $str[$y0 + $x];
                    }
                } else {
                    for ($y = $height - 1; $y >= 0; $y--) {
                        $y0 = $y * $w_row;
                        for ($x = 0; $x < $w; $x++)
                            $bmpdata .= $str[$y0 + $x];
                    }
                }
                break;

            case 16:
                $w_row = $width * 2 + $padCnt;
                if ($flip) {
                    for ($y = 0; $y < $height; $y++) {
                        $y0 = $y * $w_row;
                        for ($x = 0; $x < $width; $x++) {
                            $n = (ord($str[$y0 + 2 * $x + 1]) * 256 + ord($str[$y0 + 2 * $x]));
                            $b = ($n & 31) << 3;
                            $g = ($n & 992) >> 2;
                            $r = ($n & 31744) >> 7128;
                            $bmpdata .= chr($r) . chr($g) . chr($b);
                        }
                    }
                } else {
                    for ($y = $height - 1; $y >= 0; $y--) {
                        $y0 = $y * $w_row;
                        for ($x = 0; $x < $width; $x++) {
                            $n = (ord($str[$y0 + 2 * $x + 1]) * 256 + ord($str[$y0 + 2 * $x]));
                            $b = ($n & 31) << 3;
                            $g = ($n & 992) >> 2;
                            $r = ($n & 31744) >> 7;
                            $bmpdata .= chr($r) . chr($g) . chr($b);
                        }
                    }
                }
                break;

            case 24:
            case 32:
                $byteCnt = $biBitCount / 8;
                $w_row = $width * $byteCnt + $padCnt;

                if ($flip) {
                    for ($y = 0; $y < $height; $y++) {
                        $y0 = $y * $w_row;
                        for ($x = 0; $x < $width; $x++) {
                            $i = $y0 + $x * $byteCnt; # + 1
                            $bmpdata .= $str[$i + 2] . $str[$i + 1] . $str[$i];
                        }
                    }
                } else {
                    for ($y = $height - 1; $y >= 0; $y--) {
                        $y0 = $y * $w_row;
                        for ($x = 0; $x < $width; $x++) {
                            $i = $y0 + $x * $byteCnt; # + 1
                            $bmpdata .= $str[$i + 2] . $str[$i + 1] . $str[$i];
                        }
                    }
                }
                break;

            default:
                return array('error' => 'Error parsing BMP image - Unsupported image biBitCount');
        }
        if ($this->mpdf->compress) {
            $bmpdata = gzcompress($bmpdata);
            $info['f'] = 'FlateDecode';
        }
        $info['data'] = $bmpdata;
        $info['type'] = 'bmp';
        return $info;
    }

    function _fourbytes2int_le($s) {
        //Read a 4-byte integer from string
        return (ord($s[3]) << 24) + (ord($s[2]) << 16) + (ord($s[1]) << 8) + ord($s[0]);
    }

    function _twobytes2int_le($s) {
        //Read a 2-byte integer from string
        return (ord(substr($s, 1, 1)) << 8) + ord(substr($s, 0, 1));
    }

# Decoder for RLE8 compression in windows bitmaps
# see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_6x0u.asp

    function rle8_decode($str, $width) {
        $lineWidth = $width + (3 - ($width - 1) % 4);
        $out = '';
        $cnt = strlen($str);
        for ($i = 0; $i < $cnt; $i++) {
            $o = ord($str[$i]);
            switch ($o) {
                case 0: # ESCAPE
                    $i++;
                    switch (ord($str[$i])) {
                        case 0: # NEW LINE
                            $padCnt = $lineWidth - strlen($out) % $lineWidth;
                            if ($padCnt < $lineWidth)
                                $out .= str_repeat(chr(0), $padCnt);# pad line
                            break;
                        case 1: # END OF FILE
                            $padCnt = $lineWidth - strlen($out) % $lineWidth;
                            if ($padCnt < $lineWidth)
                                $out .= str_repeat(chr(0), $padCnt);# pad line
                            break 3;
                        case 2: # DELTA
                            $i += 2;
                            break;
                        default: # ABSOLUTE MODE
                            $num = ord($str[$i]);
                            for ($j = 0; $j < $num; $j++)
                                $out .= $str[++$i];
                            if ($num % 2)
                                $i++;
                    }
                    break;
                default:
                    $out .= str_repeat($str[++$i], $o);
            }
        }
        return $out;
    }

# Decoder for RLE4 compression in windows bitmaps
# see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_6x0u.asp

    function rle4_decode($str, $width) {
        $w = floor($width / 2) + ($width % 2);
        $lineWidth = $w + (3 - ( ($width - 1) / 2) % 4);
        $pixels = array();
        $cnt = strlen($str);
        for ($i = 0; $i < $cnt; $i++) {
            $o = ord($str[$i]);
            switch ($o) {
                case 0: # ESCAPE
                    $i++;
                    switch (ord($str[$i])) {
                        case 0: # NEW LINE                        
                            while (count($pixels) % $lineWidth != 0)
                                $pixels[] = 0;
                            break;
                        case 1: # END OF FILE
                            while (count($pixels) % $lineWidth != 0)
                                $pixels[] = 0;
                            break 3;
                        case 2: # DELTA
                            $i += 2;
                            break;
                        default: # ABSOLUTE MODE
                            $num = ord($str[$i]);
                            for ($j = 0; $j < $num; $j++) {
                                if ($j % 2 == 0) {
                                    $c = ord($str[++$i]);
                                    $pixels[] = ($c & 240) >> 4;
                                } else
                                    $pixels[] = $c & 15;
                            }
                            if ($num % 2)
                                $i++;
                    }
                    break;
                default:
                    $c = ord($str[++$i]);
                    for ($j = 0; $j < $o; $j++)
                        $pixels[] = ($j % 2 == 0 ? ($c & 240) >> 4 : $c & 15);
            }
        }

        $out = '';
        if (count($pixels) % 2)
            $pixels[] = 0;
        $cnt = count($pixels) / 2;
        for ($i = 0; $i < $cnt; $i++)
            $out .= chr(16 * $pixels[2 * $i] + $pixels[2 * $i + 1]);
        return $out;
    }

}

?>